CHAPTER 14 / HOW TO ATTACK SAT WRITING QUESTIONS 501
The entire editorial staff worked diligent for completing
the article in time for the midnight deadline.
(A) diligent for completing
(B) diligent in order to complete
(C) diligently for completing
(D) diligent to complete
(E) diligently to complete
The most obvious problem is that diligent, an
adjective, should be changed to diligently,an adverb,
because it modifies the verb worked. But don’t jump
right to choice (C) because the sentence also contains
an error in idiom(Chapter 15, Lesson 10). The correct
answer is (E) because it corrects both the modifier
problem and the idiom problem.